I'm afraid I need a tip again.
I am using webmin to control the backups for MySQL (backup the various databases), but the scheduled backup option doesn't want to be enabled. I can select scheduled backups (hourly, to make sure it works) but it doesn't work, and when I go back to the options, the scheduled backup shows as not activated...
I have also noticed that when i go to the MySQL Database Server part in the LAMPP part of Webmin, it says:
Warning: The Perl module DBD::mysql is not installed on your system, so Webmin will not be able to reliably access your MySQL database. Click here to install it now.Now when I click to install the module, it says it cannot install because it's looking for a file (mysql.h) and it cannot find it...
Installation of Msql::Mysql::modules failed. Check the output above and try installing manually.Where is your MySQL installed? Please tell me the directory thatcontains the subdir 'include'. [/usr/local] /usr/localCannot find one of include/mysql/mysql.h, include/mysql.h in /usr/local at lib/DBD/mysql/Install.pm line 165.Any ideas, anyone?

Oh, and i've tried to download the module manually, but can't figure out how to install it manually.... Sorry

Right, had to learn German for this one, with the help of someone else at work, but I've found the solution in the German section of the forum.
So, for anyone who can't read German, here's the solution (dead easy, thanks to Kai!):

Still does not help, please can anyone help me install DBD-mysql under xampp linux, i'm wracking my brains out here!!!!!!!!

Can't exec "mysql_config": No such file or directory at Makefile.PL line 73.

Cannot find the file 'mysql_config'! Your execution PATH doesn't seem
not contain the path to mysql_config. Resorting to guessed values!
Can't exec "mysql_config": No such file or directory at Makefile.PL line 248.
Can't exec "mysql_config": No such file or directory at Makefile.PL line 248.
Can't exec "mysql_config": No such file or directory at Makefile.PL line 248.
Can't exec "mysql_config": No such file or directory at Makefile.PL line 248.
Can't exec "mysql_config": No such file or directory at Makefile.PL line 248.
Failed to determine directory of mysql.h. Use

perl Makefile.PL --cflags=-I<dir>

to set this directory. For details see the INSTALL.html file,
section "C Compiler flags" or type